Pyro Industries API-1394PCI Manual de usuario descargar pdf (Pagina 75)

CHAPTER 2: CAPTURING ■

not to overfill your drives, because the media databases will continually need to rebuild

as you edit

Which drive(s) should you select for capturing media? If you have a set of

striped or RAID drives, you can choose it. If you have a spare drive for media, choose

that one. It’s not a particularly good idea to choose your system drive, but if you’re on

a laptop and it’s all you have, try using it. Most system drives are too slow for capture

at high resolution. If the selection is grayed-out, there’s a Drive Filtering Setting that

needs to be changed. Here’s how to do it: Go to your Settings tab in the Project win-

dow and select Media Creation, or optionally press Ctrl+5/F+5. The Media Creation

box appears. Deselect Drive Filtering Based Upon Resolution. This will allow all avail-

able drives (except the operating system and launch drive) to be selected. If you want

your system drive to be available, deselect these drives as well. When you return to the

Capture tool and click the drive selection button, the drive names will appear in black,

indicating that they can be selected.

Digitizing Tracks to Separate Drives

On the left side of the Drive Selection register is a single drive icon ( or ). Click

it, and two drive icons appear. Cool, huh? The two icons represent the capability to

place video and audio on separate drives, assuming that you actually have more than

one drive.

There are number of reasons to split the video and audio capture to separate

drives. For example, if the video files need to go out for special effects processing, or if

the audio files are needed for mixing or creating a premix of your sequence, it makes

the file organization easier if you use separate drives. If you have two drives, and one is

running at a slower rpm or cannot cache data as quickly as the other, digitize the audio

files to the slower drive and the video to the faster one. Audio files are smaller and can

be processed using lower drive speeds, but video—particularly at lossless resolutions—

is more demanding for speed and data rates. Splitting audio and video can also help

throughput and prevent dropped frames or underrun errors.

DV Capture Offset

Although FireWire is a fairly reliable protocol for capturing, you might encounter some

unexpected turbulence. For example, when processing pictures with any type of device

through FireWire protocol, there is a chance that audio can precede video when going

into your Avid. This usually occurs when using a transcoder while capturing from a

non-DV source through FireWire. As the images go through processing to convert to a

FireWire signal in the transcoder, the resulting picture and sound arrive through FireWire,

but are captured out of sync.

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Pyro Industries API-1394PCI Manual de usuario Pagina 75